.video-container {
    height: 400px;
    width: 100%;
    overflow: hidden;
    position: relative;
}

.video-container video {
    object-fit: cover;
    width: 100%;
    height: 100%;
}

.overlay {
    position: absolute;
    top: 0;
    /* 将overlay上边缘与video上边缘对齐 */
    left: 0;
    /* 将overlay左边缘与video左边缘对齐 */
    right: 0;
    /* 将overlay右边缘与video右边缘对齐 */
    bottom: 0;
    /* 将overlay下边缘与video下边缘对齐 */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    /* 添加文字阴影，使其更加醒目 */
    z-index: 1;
    /* 将overlay放在视频上面 */
}

.title {
    font-size: 50px;
    font-family: Arial, sans-serif;
    font-weight: bold;
    margin-bottom: 30px;
}

.search-box {
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 20px;
    padding: 10px;
    width: 800px;
}

.navbar {
    height: 80px;
}

.navbar-brand {
    color: #fff !important;
    font-size: 30px !important;
}

.navbar-nav .nav-link {
    color: #fff !important;
}

.b-list-group-item {
    border-top: none;
    border-left: none;
    border-right: none;
}


.list-group {
    height: 800px;
}

.custom-modal .modal-dialog {
    max-width: 800px;
}

.round-button {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: rgb(248, 240, 240);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    margin-left: 500px;
}